Auschwitz I camp was surrounded by a double barbed wire fence installed on 3.3 m high concrete posts. Under the fence, approx. Concrete slabs were put 1 meter deep to prevent the prisoners from digging tunnels. The SS men guarded the camp perimeter using several watch towers, 7 and 11 meters high. | Auschwitz Memorial / Muzeum Auschwitz

Texas Rancher - How to Repair a Broken Barbed Wire Fence...